Same here.
Horrible, abysmal performance on Acer Aspire 3690 laptop with 1.6 GHz Celeron processor and 1.5 GB of memory, onboard video card. I'm running Windows XP SP2.
The mouse pointer barely moves in the menu screens, and mouse clicks don't register over the buttons. In the game screen, the gameplay is jerky even on the lowest resolution and with the background effects turned off.
Also, I use extended desktop, because I much prefer my external LCD monitor to the laptop monitor. When on single desktop, the gameplay performance is a little better (though still not acceptable, with low resolutions), but menu screens performance is still way off.